Recycling (Waste, etc.), Sewage sludge
Recent advances in activated sludge facilities operations utilize sludge recycle flow rate control to minimize adverse effects on the clarifier during peak solids loading situations. Although this control action is directed at the thickening function, there has been speculation that the elevated recycle rates may be responsible for an increased effluent solids concentration. To evaluate the significance of recycle rate to the steady-state effluent suspended solids concentration, identical side-by-side settling columns were operated with recycle rates spanning the range of normal practice. The studies were conducted so that each side-by-side unit received identical activated sludge feed slurries. Replicate experimental units operating at identical recycle rates and receiving identical feed slurries were used to determine experimental error. The experimental design facilitated a statistical determination of the significance of the effect of recycle flow rate. An analysis of variance procedure was pursued, with the conclusion that recycle rate does, in fact, influence suspended solids removal. Ramifications for facilities design and operation is also reviewed.
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Dietz, John D.
Master of Science (M.S.)
College of Engineering
Length of Campus-only Access
Masters Thesis (Open Access)
Margio, Joseph A., "The Effect of Recycle Control on Activated Sludge Clarification Efficiency" (1985). Retrospective Theses and Dissertations. 4775.